Chair-iron.



No. 802,963. PATENTED OCT. 31, 1905.

H. W. BOLENS.

CHAIR IRON.

APPLICATION FILED DEC: 10. 1904 2 SHEETS-SHEET 1.

mnvim' No. 802,963. PATENTED OCT. 31, 1905.

H. W. BOLENS. CHAIR IRON.

APPLICATION FILED DEG.10. 1904 2 SHBETS-SHEET 2.

Gawain: -J

I Within; 4 I wp UNITED STATES PATENT OFFIOE.

Specification of Letters Patent.

Patented Oct. 31, 1905.

Application filed December 10,1904. Serial No. 236,287.

To all whom it may concern.-

Be it known that I, HARRY W. BOLENS, a citizen of the United States, residing at Port Washington, in the county of Ozaukee and State of Wisconsin, have invented a Chair- Iron, of which the following is a specification.

This invention relates to improvements in chair-irons or spiders employed in tilting and revolving chairs, the general objects in view being to strengthen, cheapen, and minimize the number of parts comprising the same.

d Other objects and advantages of the invention will hereinafter appear, and the novel features thereof will be particularly described, and pointed out in the claims.

Referring to the drawings, Figure 1 is a top plan view of a chair-iron or spider embodying my invention. Fig. 2 is a side elevation thereof. Fig. 3 is a longitudinal vertical sectional view on the line a: w of Fig. 1. Fig. 4 is a transverse vertical sectional view on the line y y of Fig. 1.

Like numerals of reference indicate like parts throughout the drawings.

The spindle 1 may be mounted upon any suitable form or style of vertical adjustment, and the spindle supports at its upper end a yoke 2, preferably formed of cast metal. This yoke is of general U shape, comprising the central boss or hub 3, which receives the spindle and the upwardly-disposed sides or arms 4 for supporting the spreader-plate. At their upper ends the sides or arms 4 are recessed transversely at their outer sides for a portion of their length to form stop-shoulders 5, which preferably decline from their front toward their rear ends. The unrecessed portions of the upper ends of the sides or arms 4 constitute bearing standards 6, the same having alining perforations designed to accommodate a transverse pintle 7 for pivotally supporting the spreader-plate, as will hereinafter appear. At their rear the sides or arms 4 may be connected and strengthened by a transverse integral web 8, at the center of which is formed a hub 9, constituting the bearing for the inner end of the tension-spring 10. Of course should it be desired to employ duplicate tension-springs the web would be formed accordingly.

The horizontal spreader-plate 11 is preferably rectangular in shape and formed of sheet metal, said plate substantially agreeing in width with the yoke 2. Depending from the front edge of the spreader-plate is a castmetal bridge -piece 12, the same preferably having its upper end widened and bifurcated to form spreader-plate-engaging arms or fingers 13. As will be understood, these engaging arms or fingers are angular at their inner sides, so as to conform to the front edge of the spreader-plate and overlap the same at each side of the center. The bridge-piece further comprises a front depending notched and bifurcated apron 14, through which and the bearing-hub 9 and tension-spring 10 passes the usual tension screw or rod 15. Upon the front end of the rod is the usual nut and adjusting-wheel 16 and 17 respectively.

Any well-known style of spider-arms may be mounted upon and secured to the spreaderplate; but I prefer the three-contact style herein shown. The two longitudinal or forwardly-projecting arms 19 are preferably formed integral and of angle-steel, the rightangular flanges of the arms fitting neatly overthe opposite sides or edges of the spreaderplate at each side of the engaging fingers 13 and being connected to said plate by rivets 20. In constructing the spider-arm frame 19 I prefer to take a blank of angle-steel of suitable length and sever on converging lines one at each side of the centerthe upper or horizontal flange forming a V-shaped or angular notch. The two terminals thus formed are then bent inwardly or toward each other and in parallelism for the major portion of their length, whereby the edges of the V- shaped or angular notch are brought substantially in contact and the notch substantially closed. The bent or front end of the frame is slightly upwardly disposed, as at 21, to form a contact-point, and also provided with suitable screw-holes. Of course this operation is merely a suggestion and may or may not be followed. So, also, may the contour of the spider-arm frame be varied from the exact form herein shown. The rear ends of the arms 19 are flush with the rear edge of the spreader-plate, and surmounting the arms and the plate at therear edge of the latter is the rear transverse spider arm 22. This transverse arm is also preferably formed of angle-steel, and the rivets 20 employed at the rear ends of the arms 19 also pass through the arm 22, whereby the latter is secured to position. The opposite terminals of this rear arm are raised to the same plane as the front portion of the arms 19, so as to form the remaining two contact ends 23, which are perforated for the usual screws. The outer or vertical flanges of the opposite arms 19 are IIO ders arrest the further forward movement of the spreader. and, on the other hand, when the chair is tilted or rocked to the rear the stop-shoulders being inclined will permit of all reasonable and desirable tilt of the chair against the tension of the spring and until such movement is arrested by the said flanges of thearms 19 coming in contact with the rear portions of the inclined stop-shoulders 5.

In order to render the bridge-piece exceedingly strong and reduce the chance of breakage to a minimum, I may strengthen this much-strained part by securely bracing the same by means of a rearwardly-disposed integral plate 25, which takes under the spreader-plate 11 and is connected to the apron 14 of the bridge-piece by an intermediate integral web 26. The latter is preferably provided with a perforation 27for the assage of the pintle 7, so that the latter ai s in re taining the bridge-piece upon the spreaderlate. p It will be observed that I have produced a most compact and exceedingly strong chairiron or spider, the same being formed of very few parts of a combination of cast-iron and sheet metal, the whole structure being rigid and exceedingly simple, while lending a maximum amount of comfort. In constructing the spider-arm frame 19 I prefer to take a blank of angle-iron of suit able length and sever on converging lines, one at each side of the center, the u per or horizontal flange forming a V-shape notch. The two terminals or spider-arms are then brought toward each other and the meeting edges made to substantially contact. This constitutes a convenient mode of bending.

Having thus described my invention,what I claim as new, and desire to secure by Letters Patent, is

1. The combination, in a chair-iron, of a s reader-plate, a pivotal sup orting means t erefor, a substantially U-dhaped spiderarm frame formed of angle-iron having its central portion shaped to form a point of contact and perforated to receive attachingscrews, and its opposite terminals constituting spider-arms secured upon the spreaderplate, and a rear transverse spider-arm mounted on the terminals of the Ushaped spiderarm frame and the spreader-plate and having its ends shaped to form opposite contacts and perforated to receive attaching-screws.

2. The combination, in a chair-iron, of a 3. The combination, in a chairiron, of a spreader-plate, op osite spider-arms formed of angleiron em racing the opposite side edges of said spreaderlate, a rear transverse spider-arm forme of angle-iron and embracing the rear edge of the spreader-plate and surmounting the rear terminals of the spider-arms, and rivets passed through the twosets of spider-arms and the spreaderplate.

4. The combination, in a chair-iron, of a yoke having opposite stop-shoulders, a spreaderlate pivotally mounted on the yoke, an spider-arms formed of angle-iron mounted on the spreader late and embracing the same, whereby the ower edges of the spider-arms are adapted to contact with said stop-shoulders and limit the pivotal movement of the spreader-plate.

5. The combination, in a chair-iron, of a yoke, a spreader-plate pivotally su' ported therein, a bridge-piece engaging the ont of the spreaderlate and extending between the yoke-terminals and out of contact therewith, and a tension device carried by the bridgepiece.

6. The combination, in a chair-iron, of a yoke, aspreader-plate pivotally mounted therein, a bridge piece depending from the front edge of the s reader-plate and having an extension passe under and braced against the spreader-plate, and a tension device carried by the bridge-piece.

7. The combination, in a chair-iron, of a yoke, a sheet-metal spreader pivotally supported in the uplper end thereof, a brid epiece formed in ependent of the sprea er and comprising an upper widened engaging end taking over the edge of the spreaderplate, a depending apron out of contact with the yoke, a brace extending rearwardly and contacting with the spreader-plate and a tension device carried by the apron.

8. The combination, in a chair-iron, of a yoke, a spreader-plate pivotally mounted therein, a bridge-piece comprising a widened bifurcated upper end terminatin in spreaderplate-en aging fingers, a depen ing apron, a rearwar ly-disposed plate passing under the spreader plate, a -bracing-web between the a ron and plate, and a tension device carried by the apron.

9. The combination, in a chair-iron, of a yoke, a s reader-plate pivotally mounted therein, a ridge-piece comprising a widened bifurcated upper end terminating in spreaderplate-engaging fingers, a depending a ron, a rearwardly-disposed plate passing un er and braced against the spreader-plate, and a tension device carried by the apron.

10. The combination, in a chair-iron, of a spreader plate, means for su porting the same, and a s ider-arm frame ormed of angle-iron, said ame having a V-notch formed in its upper horizontal flange and its edges brought substantially in contact to form a oint of contact, the terminals of the frame eing secured to said spreader-plate.

11. In a chair-iron, the combination, with a spreader-plate and a yoke for supporting the same, of an apron bearing at its front end against the front edge of the spreader plate and having its rear portion extended under and bearing against the spreader-plate, and a tension device carried by said apron.

12. In a chair-iron, the combination, with a spreader and a yoke for supporting the same, of an apron connected at its front end to the front of the spreader and having its rear portion extended under and bearing against the under side of the spreader, and a tension device carried by said apron.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HARRY W. BOLENS. Witnesses W. S. DUVALL, H. S. BEALLIH 

